CN114807746B - HRB500E twisted steel bar produced by high-speed bar - Google Patents
HRB500E twisted steel bar produced by high-speed bar Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides HRB500E twisted steel produced by high-speed bars, and the specification of the product is 10-25 mm; the HRB500E twisted steel produced by the high-speed bar comprises the following components: c:0.21 to 0.25Wt%, si: 0.65-0.80 Wt%, mn: 1.2-1.35 Wt%, P: less than or equal to 0.04Wt%, S: less than or equal to 0.035Wt%, V:0.03 to 0.06Wt%, nb: 0.008-0.02 Wt%, N: 0.007-0.017 Wt%, B:0.001 to 0.003Wt%, cr: 0.1-0.2 Wt%. High production efficiency and good surface quality. Reasonable yield strength and higher tensile strength are obtained.
Description
The invention is as follows: application date: 28/5/2021, application No.: 202110592869X, title of the invention: a method for producing HRB500E twisted steel bars by high-speed bars and a divisional application of the HRB500E twisted steel bars produced by the high-speed bars.
Technical Field
The invention relates to the field of metallurgy, in particular to HRB500E twisted steel produced by high-speed bars.
Background
The steel bar produced by the high-speed bar has good control on the overall dimension, the finish rolling speed can reach 45m/s or above, and the steel bar has the advantages of high yield, high quality and low cost, and is the development trend of the production of the current medium and small-sized twisted steel bars. Because the high-speed bar has high deformation speed and can use the controlled rolling and controlled cooling process, the HRB500E steel bar with fine grains is produced. However, when HRB500E steel bars with higher strength are produced, the contribution of fine grain strengthening to yield strength is large, the contribution of tensile strength is weak, and the requirement of the yield ratio R DEG of HRB500E earthquake-resistant steel bars is difficult to meet m /R° eL 1.25 or more.
In summary, the following problems exist in the prior art: the HRB500E thread steel bar produced by the existing high-speed bar is difficult to meet the yield ratio R DEG m /R° eL 1.25 or more.
Disclosure of Invention
The technical problem solved by the embodiment of the invention is that the HRB500E twisted steel bar produced by the existing high-speed bar is difficult to meet the yield ratio R DEG m /R° eL A requirement of 1.25 or more.
To this end, in one aspect, an embodiment of the present invention provides a method for producing an HRB500E twisted steel from a high-speed bar, where the method for producing an HRB500E twisted steel from a high-speed bar includes:
the method comprises the following steps of smelting blast furnace molten iron, desulfurizing and pretreating the molten iron, smelting converter molten steel, blowing argon, LF refining, continuous casting of square billets, heating by a heating furnace, rough rolling, intermediate rolling, pre-finish rolling, controlled cooling and recovery, finish rolling, controlled cooling and recovery after rolling;
the HRB500E twisted steel produced by the high-speed bar comprises the following components: c:0.21 to 0.25Wt%, si: 0.65-0.80 Wt%, mn: 1.2-1.35 Wt%, P: less than or equal to 0.04Wt%, S: less than or equal to 0.035Wt%, V:0.03 to 0.06Wt%, nb: 0.008-0.02 Wt%, N: 0.007-0.017 Wt%, B:0.001 to 0.003Wt%, cr: 0.1-0.2 Wt%.
Specifically, for HRB500E twisted steel with the specification of 10-16 mm, the components are as follows: c:0.21 to 0.25Wt%, si: 0.65-0.80 Wt%, mn: 1.2-1.35 Wt%, P: less than or equal to 0.04Wt%, S: less than or equal to 0.035Wt%, V:0.03 to 0.045Wt%, nb: 0.008-0.02 Wt%, N: 0.007-0.015 Wt%, B:0.001 to 0.002Wt%, cr: 0.1-0.2 Wt%.
Specifically, for HRB500E twisted steel with the specification of 18-25 mm, the components are as follows: c:0.21 to 0.25Wt%, si: 0.65-0.80 Wt%, mn: 1.2-1.35 Wt%, P: less than or equal to 0.04Wt%, S: less than or equal to 0.035Wt%, V:0.045 to 0.06Wt%, nb: 0.008-0.02 Wt%, N: 0.009-0.017 Wt%, B: 0.002-0.003 Wt%, cr: 0.1-0.2 Wt%.
Specifically, the method for producing the high-speed bar steel bar by the single line comprises the following steps: blast furnace molten iron smelting, molten iron desulphurization pretreatment, converter molten steel smelting, argon blowing, LF refining, square billet continuous casting, heating furnace heating, rough rolling, medium rolling (6 frames), pre-finish rolling (6 frames), single line, pre-finish rolling, controlled cooling and recovery section, finish rolling (4 frames), finish rolling (2 frames of reducing diameter), controlled cooling and recovery section after rolling, pinch rolls, disc double-length shear, braking device, hub device, cooling bed cooling and fixed-length shear.
Specifically, the method for producing the high-speed bar steel bars in a double-line mode comprises the following steps: the method comprises the following steps of smelting in a blast furnace molten iron, desulfurizing and pretreating the molten iron, smelting in a converter molten steel, blowing argon, LF refining, continuous casting of square billets, heating in a heating furnace, rough rolling, intermediate rolling, pre-finish rolling and splitting into double lines, pre-finish rolling and controlled cooling and recovery sections of the double lines, finish rolling of the double lines, double-line diameter reduction of 2 frames, controlled cooling and recovery sections after double rolling, double-line pinch rolls, double-line disc double-length shear, double-line braking devices, double-line hub devices, cooling bed cooling and fixed-length shearing.
Specifically, the reducing unit adopts 2 frames of 45-degree top-cross cantilever reducing machines, and realizes rolling below the recrystallization temperature or in a dual-phase region through independent transmission.
Specifically, the finishing mill group is divided into two lines and adopts 4 frames of 45-degree top cross cantilever V-shaped non-twist ultra-heavy-load Morgan rolling mills.
Specifically, the deformation of the last two machine frame passes is more than 15%.
Specifically, for HRB500E threaded steel bars with the specification of 10-16 mm, the finish rolling speed is not less than 25m/S.
On the other hand, the embodiment of the invention also provides an HRB500E twisted steel produced by the high-speed bar, and the HRB500E twisted steel produced by the high-speed bar comprises the following components: c:0.21 to 0.25Wt%, si: 0.65-0.80 Wt%, mn: 1.2-1.35 Wt%, P: less than or equal to 0.04Wt%, S: less than or equal to 0.035Wt%, V:0.03 to 0.06Wt%, nb: 0.008-0.02 Wt%, N: 0.007-0.017 Wt%, B:0.001 to 0.003Wt%, cr: 0.1-0.2 Wt%, and is made by adopting a method for producing HRB500E twisted steel bars by high-speed bars.
Compared with the HRB500E reinforcing steel bar of the conventional production line, the method for producing the HRB500E twisted steel bar by the high-speed bar has the advantages that the alloy addition is reduced, and the production cost is reduced. The qualified HRB500E steel bar can be successfully produced by a high-speed bar production line, and the production efficiency is high and the surface quality is good. The elements with large contribution to the tensile strength are controlled according to the upper limit, elements which can enable the CCT curve to move to the right such as V, N, B, cr, nb and the like are added, and finally a small amount of bainite structures are formed in the core metallographic structure of the high-speed bar HRB500E seismic steel bar, so that reasonable yield strength and high tensile strength are obtained.
Detailed Description
The present invention will now be described in order to more clearly understand the technical features, objects, and effects of the present invention.
The invention provides a method for producing HRB500E twisted steel by a high-speed bar, which comprises the following steps:
the production process of the single-wire high-speed bar steel bar comprises the following steps: blast furnace molten iron smelting, molten iron desulphurization pretreatment, converter molten steel smelting, argon blowing, LF refining, square billet continuous casting, heating furnace heating, rough rolling (6 frames), medium rolling (6 frames), pre-finish rolling (6 frames), single line, controlled cooling and recovery section, finish rolling (4 frames), finish rolling (diameter shearing 2 frames), controlled cooling and recovery section after rolling, pinch rolls, disc double-length shear, braking device, hub device, cooling bed cooling, fixed-length shear, inspection, packaging and warehousing. Is beneficial to refining crystal grains and reducing the cost. The reinforcing steel bars are stored on the stepping cooling bed by one tooth, so that heat dissipation is accelerated, and the large-size steel bars are cooled by air on the cooling bed.
The production process of the double-line high-speed bar steel bar comprises the following steps: blast furnace molten iron smelting, molten iron desulphurization pretreatment, converter molten steel smelting, argon blowing, LF refining, square billet continuous casting, heating by a heating furnace, rough rolling (6 frames), intermediate rolling (6 frames), pre-finish rolling (6 frames) and cutting into double lines, a controlled cooling and recovery section multiplied by 2, finish rolling (4 frames) multiplied by 2, a shearing diameter 2 frames multiplied by 2, a controlled cooling and recovery section multiplied by 2 after rolling, a pinch roll multiplied by 2, a disc double-length shear multiplied by 2, a braking device multiplied by 2, a hub device multiplied by 2, cooling bed cooling, fixed-length shearing, inspecting, packaging and warehousing. Is beneficial to refining crystal grains and reducing the cost. The reinforcing steel bars are stored on each tooth of the stepping cooling bed, so that heat dissipation is accelerated, and large-size reinforcing steel bars are cooled by air on the cooling bed.
The rolling speed is kept high for different specifications.
Wherein, the process characteristics of each stage are as follows:
1. the components:
(1) C, si: the solid solution strengthening effect is achieved, the contribution to the tensile strength is large, the contribution to the yield strength is small, and the upper limit is controlled.
(2) Mn: the Mn is controlled at a moderate level, the cost can be reduced, and the lost strength is compensated by fine crystalline reinforcement at a lower temperature.
(3) Adding Nb to raise austenite recrystallization temperature, realizing non-recrystallization rolling at higher temperature and having precipitation strengthening effect, raising strength and increasing iron scale thickness. The trace amount of niobium dissolved in austenite delays the precipitation of pro-eutectoid ferrite and increases the time for the austenite to start decomposing and precipitating pearlite, but it hardly affects the transformation of bainite, and increases the transformation temperature of bainite, which is an advantageous element for forming bainite, so that Nb is added to control the bainite structure, and forms carbonitride to increase the strength.
(4) V, N, B content. The V element and a small amount of B in the steel compete for N in the steel, and V and N are combined to produce VN so as to improve the strength of the steel and make B difficult to combine with N to form BN. B exists on the austenite grain boundary, thereby reducing the austenite grain boundary energy and improving the stability of austenite in the temperature range above martensite, therefore, trace B can obviously improve the hardenability of steel. The elements with large contribution to the tensile strength are controlled according to the upper limit, elements which can enable the CCT curve to move to the right such as V, N, B, cr, nb and the like are added, and finally a small amount of bainite structures are formed in the core metallographic structure of the high-speed bar HRB500E seismic steel bar, so that reasonable yield strength and high tensile strength are obtained.
(5) And a Cr element. Cr has the solid solution strengthening effect, has a relatively low diffusion speed in austenite, and can obstruct the diffusion of carbon, so that the stability of the austenite can be improved, the CCT curve can be shifted to the right, the critical cooling speed is reduced, the hardenability is improved, and bainite can be formed.
TABLE 1HRB500E composition (wt%)
2. Arranging a rolling line:
6 rough rolling frames, 6 middle rolling frames, 6 pre-finish rolling frames, a controlled cooling device, a recovery section, 4 finishing mill groups, a controlled cooling device, a recovery section and 2 reducing mills.
6 stands of short stress line rolling mill of roughing mill group + 6 stands of short stress line rolling mill of middle rolling + 6 stands of short stress line rolling mill of finish rolling in advance (all stands are connected through the loop, carry on two segmentations to the rod from the 4 th stand, and enter two channels separately at the exit of finish rolling in advance)
The finishing mill group is two lines and adopts 4 top-crossed cantilevers (V-shaped) of 45 degrees to have no torsion and overload type Morgan rolling mills, 2 groups of modules are totally adopted, and each group of modules is driven by a motor alone, compares the collective transmission, has following advantages: each group of rollers can be independently regulated, the speed regulation range is wide, and the speed regulation flexibility is high; each motor has small power and small size; is convenient for maintenance and repair.
The reducing unit adopts 2 frames of 45-degree top-cross cantilever reducing machines for independent transmission. The addition of the reducing unit can realize rolling below the recrystallization temperature or in a dual-phase region (namely rolling by a heating machine), and the aims of refining grains and improving the performance of steel are fulfilled by designing a deformation system of the last two passes to crush the grains and inducing ferrite phase change by deformation. In addition, the production rate of the rolling mill can be improved, the dimensional tolerance and the surface quality of products can be improved, the variety and the specification can be increased, the metallurgical performance of the products can be improved, and the like.
The reducing unit adopts 2 frames of 45-degree top-cross cantilever reducing machines, and realizes rolling below the recrystallization temperature or in a double-phase region through independent transmission.
The finishing mill group is a two-line V-shaped non-twist overload Morgan rolling mill with 4 frames of top cross cantilevers of 45 degrees.
And the deformation of the last two machine frame passes is more than 15%.
For HRB500E threaded steel bars with the specification of 10-16 mm, the finish rolling speed is not less than 25m/S.
3. The rolling process comprises the following steps:
(1) The heating time of the billet is 60-90 minutes, and the initial rolling temperature is as follows: 1030 +/-30 ℃.
(2) Double-line and single-line rolling with the specification of phi 10-phi 16 mm: the temperature of finish rolling and the temperature of the reducing mill are controlled, the austenite recrystallization temperature is increased by Nb, the non-recrystallization rolling of austenite can be realized at higher temperature, cooling control equipment cannot be installed behind the reducing mill, the formation of the scale is facilitated, and the temperature of the reducing mill can be slightly higher due to large deformation during single-line rolling, so that the generation of the scale is more facilitated.
(3) Double-line and single-line rolling with phi 18-phi 25 specifications: the finish rolling unit is not put into use, the water tank after pre-finish rolling and finish rolling is used by utilizing the concept of graded cooling control, the water tank is kept in a long-open state, the phenomenon that the intensity of primary cooling is overlarge and is not beneficial to the control of organization and iron scale is avoided, and the temperature of the reducer can be slightly higher due to the large deformation during single-line rolling, so that the generation of the iron scale is more beneficial. After the reducing mill is arranged to the front of the upper cooling bed, no cooling control equipment is arranged and used, so that the steel bar is in a natural cooling state, and the surface of the steel bar obtains higher temperature of the upper cooling bed.
(4) The deformation of the last two machine frames (K1 and K2) is more than 15 percent.
TABLE 2 Rolling Key temperature (wt%)
4. Finish rolling speed: the rolling speed is kept higher for different specifications, which is beneficial to grain refinement (see table 3).
TABLE 3 Final Rolling speed
5. Cooling by a cooling bed: the reinforcing steel bars are stored on each tooth of the stepping cooling bed, so that heat dissipation is accelerated, and large-size reinforcing steel bars are cooled by air on the cooling bed.
The method can control the bainite content at the edge part of the cross section of the HRB500E steel bar structure to be 0 percent, the bainite content at the 1/4 part to be 0 percent and the bainite content at the center part of the cross section to be 1 to 10 percent. And successfully producing qualified HRB500E steel bars by using a high-speed bar production line.
The invention also provides HRB500E twisted steel produced by the high-speed bar, which comprises the following components: c:0.21 to 0.25Wt%, si: 0.65-0.80 Wt%, mn: 1.2-1.35 Wt%, P: less than or equal to 0.04Wt%, S: less than or equal to 0.035Wt%, V:0.03 to 0.06Wt%, nb: 0.008-0.02 Wt%, N: 0.007-0.017 Wt%, B:0.001 to 0.003Wt%, cr: 0.1-0.2 Wt%, and is prepared by the method for producing HRB500E twisted steel by the high-speed bar.
Specifically, for HRB500E twisted steel with the specification of 10-16 mm, the components are as follows: c:0.21 to 0.25Wt%, si: 0.65-0.80 Wt%, mn: 1.2-1.35 Wt%, P: less than or equal to 0.04Wt%, S: less than or equal to 0.035Wt%, V:0.03 to 0.045Wt%, nb: 0.008-0.02 Wt%, N: 0.007-0.015 Wt%, B:0.001 to 0.002Wt%, cr: 0.1-0.2 Wt%.
Specifically, for HRB500E twisted steel with the specification of 18-25 mm, the components are as follows: c:0.21 to 0.25Wt%, si: 0.65-0.80 Wt%, mn: 1.2-1.35 Wt%, P: less than or equal to 0.04Wt%, S: less than or equal to 0.035Wt%, V:0.045 to 0.06Wt%, nb: 0.008-0.02 Wt%, N: 0.009-0.017 Wt%, B: 0.002-0.003 Wt%, cr: 0.1-0.2 Wt%.
Compared with the HRB500E reinforcing steel bar of a conventional production line, the method for producing the HRB500E twisted reinforcing steel bar by the high-speed bar has the advantages that the alloy addition is reduced, and the production cost is reduced. The qualified HRB500E steel bar can be successfully produced by a high-speed bar production line, and the production efficiency is high and the surface quality is good. The elements with large contribution to the tensile strength are controlled according to the upper limit, elements which can enable the CCT curve to move to the right such as V, N, B, cr, nb and the like are added, and finally a small amount of bainite structures are formed in the core metallographic structure of the high-speed bar HRB500E seismic steel bar, so that reasonable yield strength and high tensile strength are obtained.
The embodiment is as follows:
1. the process for producing phi 10-25 mm straight twisted steel bars by using double-line high-speed bars comprises the following steps: blast furnace molten iron smelting, molten iron desulphurization pretreatment, converter molten steel smelting, argon blowing, LF refining, square billet continuous casting, heating by a heating furnace, rough rolling (6 frames), intermediate rolling (6 frames), pre-finish rolling (6 frames) and cutting into double lines, a controlled cooling and recovery section multiplied by 2, finish rolling (4 frames) multiplied by 2, a shearing diameter 2 frames multiplied by 2, a controlled cooling and recovery section multiplied by 2 after rolling, a pinch roll multiplied by 2, a disc double-length shear multiplied by 2, a braking device multiplied by 2, a hub device multiplied by 2, cooling bed cooling, fixed-length shearing, inspecting, packaging and warehousing.
2. The heating time of the billet is 60 to 90 minutes, and the initial rolling temperature is 1010 to 1050 ℃.
3. The following components are mixed and prepared in a specific process. Wherein, table 4 is the composition (in weight percent) of the steels of the respective examples. Table 5 shows the production specifications, process parameters, mechanical properties, and scale thicknesses corresponding to the steels of the examples described in Table 4.
Table 4: chemical composition (wt%) of product
| Examples of the invention | C | Si | Mn | P | S | V | Nb | N | B | Cr |
| Example 1 | 0.23 | 0.70 | 1.25 | 0.035 | 0.027 | 0.035 | 0.012 | 0.0126 | 0.0015 | 0.14 |
| Example 2 | 0.24 | 0.75 | 1.22 | 0.029 | 0.025 | 0.041 | 0.015 | 0.0121 | 0.0017 | 0.16 |
| Example 3 | 0.22 | 0.72 | 1.26 | 0.031 | 0.033 | 0.037 | 0.016 | 0.0135 | 0.0014 | 0.15 |
| Example 4 | 0.24 | 0.69 | 1.28 | 0.026 | 0.032 | 0.055 | 0.014 | 0.0159 | 0.0026 | 0.12 |
| Example 5 | 0.25 | 0.71 | 1.23 | 0.033 | 0.029 | 0.052 | 0.013 | 0.0142 | 0.0023 | 0.18 |
Table 5: specific process parameters and mechanical properties of the examples
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it is intended that all equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. HRB500E twisted steel produced by high-speed bars is characterized in that the specification of the product is 10-25 mm; the HRB500E twisted steel produced by the high-speed bar comprises the following components: c:0.21 to 0.25wt%, si: 0.65-0.80 wt%, mn:1.2 to 1.35wt%, P: less than or equal to 0.04wt%, S: less than or equal to 0.035wt%, V:0.03 to 0.06wt%, nb: 0.008-0.02 wt%, N: 0.007-0.017 wt%, B:0.001 to 0.003wt%, cr: 0.1-0.2 wt%, and is made by adopting a method for producing HRB500E twisted steel bars by high-speed bars;
the method for producing the HRB400E twisted steel by the high-speed bar comprises the following steps:
the method comprises the following steps of smelting blast furnace molten iron, desulfurizing and pretreating the molten iron, smelting converter molten steel, blowing argon, LF refining, continuous casting of square billets, heating by a heating furnace, rough rolling, intermediate rolling, pre-finish rolling, controlled cooling and recovery, finish rolling, controlled cooling and recovery after rolling;
heating the billet for 60 to 90 minutes at the rolling temperature: 1030 +/-30 ℃;
the method for producing the high-speed bar steel bars in a double-line mode comprises the following steps: the method comprises the following steps of smelting in a blast furnace molten iron, desulfurizing and pretreating the molten iron, smelting in a converter molten iron, blowing argon, LF refining, continuously casting a square billet, heating in a heating furnace, rough rolling, intermediate rolling, pre-finish rolling and splitting into double lines, pre-finish rolling, cooling control and recovery sections of the double lines, finish rolling of the double lines, double-line diameter reduction of 2 frames, post-double-line rolling, cooling control and recovery sections of the double lines, double-line pinch rolls, double-line disc double-length shear, a double-line braking device, a double-line hub device, cooling bed cooling and fixed-length shear;
the finish rolling temperature is: 900 +/-20, and the temperature of the reducing mill is: 880 +/-20;
the reducing unit adopts 2 top-mounted cantilever reducing machines with the angle of 45 degrees, and is driven independently to realize rolling below the recrystallization temperature or in a double-phase region;
the content of bainite on the edge of the cross section of the HRB500E steel bar structure is 0%, the content of bainite at the 1/4 part is 0%, and the content of bainite at the center of the cross section is 1 to 10%.
2. The HRB500E rebar produced from high speed bars of claim 1 having the composition, for a HRB500E rebar of gauge 10 to 16 mm: c:0.21 to 0.25wt%, si: 0.65-0.80 wt%, mn:1.2 to 1.35wt%, P: less than or equal to 0.04wt%, S: less than or equal to 0.035wt%, V: 0.03-0.045 wt%, nb: 0.008-0.02 wt%, N: 0.007-0.015 wt%, B:0.001 to 0.002wt%, cr:0.1 to 0.2wt percent.
3. The HRB500E twisted steel produced from a high speed bar according to claim 1, wherein the HRB500E twisted steel with a gauge of 18 to 25mm has the following composition: c:0.21 to 0.25wt%, si: 0.65-0.80 wt%, mn:1.2 to 1.35wt%, P: less than or equal to 0.04wt%, S: less than or equal to 0.035wt%, V: 0.045-0.06 wt%, nb: 0.008-0.02 wt%, N: 0.009-0.017 wt%, B: 0.002-0.003 wt%, cr:0.1 to 0.2wt percent.
4. The HRB500E rebar produced by the high-speed bar according to claim 1, wherein the finish rolling speed is not less than 25m/s for HRB500E rebar with the gauge of 10 to 16 mm.
5. The HRB500E rebar produced from high-speed bars of claim 1, wherein the HRB500E rebar produced from high-speed bars has a composition of: c:0.23wt%, si:0.70wt%, mn:1.25wt%, P: 0.035wt%, S:0.027wt%, V:0.035wt%, nb:0.012wt%, N:0.0126wt%, B:0.0015wt%, cr:0.14wt%, the product specification is phi 10mm, and the final rolling speed is 45m/s.
6. The HRB500E rebar produced from high-speed bars of claim 1, wherein the HRB500E rebar produced from high-speed bars has a composition of: c:0.24wt%, si:0.75wt%, mn:1.22wt%, P: 0.029wt%, S:0.025wt%, V:0.041wt%, nb:0.015wt%, N:0.0121wt%, B:0.0017wt%, cr:0.16wt%, the product specification is phi 12mm, and the final rolling speed is 38m/s.
7. The HRB500E rebar produced from high-speed bars of claim 1, wherein the HRB500E rebar produced from high-speed bars has a composition of: c:0.22wt%, si:0.72wt%, mn:1.26wt%, P: 0.031wt%, S:0.033wt%, V:0.037wt%, nb:0.016wt%, N:0.0135wt%, B:0.0014wt%, cr:0.15wt%, the product specification is phi 16mm, and the final rolling speed is 28m/s.
8. The HRB500E rebar produced from high-speed bars of claim 1, wherein the HRB500E rebar produced from high-speed bars has a composition of: c:0.24wt%, si:0.69wt%, mn:1.28wt%, P: 0.026wt%, S:0.032wt%, V:0.055wt%, nb:0.014wt%, N:0.0159wt%, B:0.0026wt%, cr:0.12wt%, the product specification is phi 20mm, and the final rolling speed is 16m/s.
9. The HRB500E rebar produced from high-speed bars of claim 1, wherein the HRB500E rebar produced from high-speed bars has a composition of: c:0.25wt%, si:0.71wt%, mn:1.23wt%, P: 0.033wt%, S:0.029wt%, V:0.052wt%, nb:0.013wt%, N:0.0142wt%, B:0.0023wt%, cr:0.18wt%, the product specification is phi 25mm, and the final rolling speed is 15m/s.
10. The HRB500E twisted steel produced from the high speed bar of claim 1, wherein the final two frame passes have a strain of greater than 15%.
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| CN114799095B (en) * | 2022-04-28 | 2023-12-29 | 广西柳州钢铁集团有限公司 | Reinforcement bar heating-free direct rolling method and reinforcement bar rolled by heating-free direct rolling method |
| CN114875205B (en) * | 2022-05-27 | 2024-03-26 | 广西柳州钢铁集团有限公司 | Non-microalloy HRB400E hot rolled ribbed bar and production method thereof |
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| DE2131318C3 (en) * | 1971-06-24 | 1973-12-06 | Fried. Krupp Huettenwerke Ag, 4630 Bochum | Process for the production of a reinforcement steel bar for prestressed concrete |
| EP1990431A1 (en) * | 2007-05-11 | 2008-11-12 | ArcelorMittal France | Method of manufacturing annealed, very high-resistance, cold-laminated steel sheets, and sheets produced thereby |
| JP5419820B2 (en) * | 2010-07-20 | 2014-02-19 | 新日鐵住金株式会社 | Rolled steel bar or wire rod for hot forging |
| CN102383039B (en) * | 2011-11-10 | 2013-07-17 | 长沙东鑫环保材料有限责任公司 | Microalloy HRB500E steel bar containing chrome and nitrogen and production method thereof |
| CN103451516B (en) * | 2013-08-30 | 2016-01-20 | 武汉钢铁(集团)公司 | HRB500 reinforcing bar and preparation method thereof |
| CN103924165A (en) * | 2014-03-26 | 2014-07-16 | 首钢水城钢铁（集团）有限责任公司 | Production method of HRB500 screw bar having yield point jog |
| CN103898403B (en) * | 2014-04-09 | 2016-06-29 | 武汉钢铁(集团)公司 | The hot-rolled ribbed anti-seismic steel bar of HRB500 level |
| CN106399855B (en) * | 2016-09-19 | 2018-09-25 | 石横特钢集团有限公司 | HRB500E Ribbed Bars bar and its production technology |
| CN107815603A (en) * | 2017-11-30 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel Bar and its LF stove production methods are built containing V, Nb, Cr microalloy |
| CN107955913A (en) * | 2017-11-30 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel wire rod and its LF stove production methods are built containing V, Nb, Cr microalloy |
| CN109355560B (en) * | 2018-11-07 | 2019-11-22 | 钢铁研究总院 | The complex intensifying cooling technique of hot-rolled microalloy reinforcing bar HRB500E |
| CN109252106A (en) * | 2018-11-23 | 2019-01-22 | 攀钢集团攀枝花钢铁研究院有限公司 | 500MPa grades contain V, Nb microalloy high yield ratio anti-seismic steel bar bar and its production method |
| CN109161812A (en) * | 2018-11-23 | 2019-01-08 | 攀钢集团攀枝花钢铁研究院有限公司 | 500MPa grades contain V, Nb microalloy high yield ratio anti-seismic steel bar wire rod and its production method |
| CN111360066B (en) * | 2020-02-21 | 2022-08-12 | 中冶赛迪工程技术股份有限公司 | Low-cost, less-red-rust, high-strength and anti-seismic deformed steel bar production method and system |
| CN111893371A (en) * | 2020-07-18 | 2020-11-06 | 钢铁研究总院 | Method for improving yield ratio qualification rate of high-strength hot-rolled ribbed steel bar |
| CN111945079A (en) * | 2020-07-31 | 2020-11-17 | 阳春新钢铁有限责任公司 | Ultra-high pulling speed niobium-containing HRB500E deformed steel bar and production process thereof |
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